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Report on Nevados de Chillan (Chile) — 20 July-26 July 2016

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 July-26 July 2016
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2016. Report on Nevados de Chillan (Chile). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 20 July-26 July 2016. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (20 July-26 July 2016)


Nevados de Chillan

Chile

36.868°S, 71.378°W; summit elev. 3180 m

All times are local (unless otherwise noted)


The Buenos Aires VAAC reported that on 21 July a webcam recorded an ash puff from Nevados de Chillán that rose to an altitude of 3 km (10,000 ft) a.s.l., and then continuous emissions of gas and minor amounts of ash that rapidly dissipated at crater level.

Geologic Background. The compound volcano of Nevados de Chillán is one of the most active of the Central Andes. Three late-Pleistocene to Holocene stratovolcanoes were constructed along a NNW-SSE line within three nested Pleistocene calderas, which produced ignimbrite sheets extending more than 100 km into the Central Depression of Chile. The largest stratovolcano, dominantly andesitic, Cerro Blanco (Volcán Nevado), is located at the NW end of the group. Volcán Viejo (Volcán Chillán), which was the main active vent during the 17th-19th centuries, occupies the SE end. The new Volcán Nuevo lava-dome complex formed between 1906 and 1945 between the two volcanoes and grew to exceed Volcán Viejo in elevation. The Volcán Arrau dome complex was constructed SE of Volcán Nuevo between 1973 and 1986 and eventually exceeded its height.

Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)